I have just upgraded to SU 2016. I have only just about finished moving/copying scrapbooks, materials, extensions, etc, from SU 2015. It would be great to have the installation of a new version do a lot of this for you.
I have also found that the Extension Warehouse is not up to speed with new versions. This makes you nervous to install old extensions and yet many will work just fine with the new version. Some work to be done there I feel.